Which set of ordered pairs represents y as a function of x?

Question 1 options:

{(1, 3), (1, 5), (1, 7), (1, 9), (1, 11)}

{(1, 2), (2, -3), (3, 4), (4, -5)}

{(1, 2), (2, 3), (3, 4), (3, 5)}

{(2, 3), (3, 5), (3, -5), (-2, 8), (-2, -8)

Atrucker had a load of grain containing 2 tons. she unloaded 1 ton and 1,200 pounds at the warehouse. how much grain does she still have left on the truck?

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons